Duke University Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA.Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA.

Duke University Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA.Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.Department of Pathology, Duke University School of Medicine, Durham, NC 27710, USA.

Duke University Human Vaccine Institute, Duke University School of Medicine, Durham, NC 27710, USA.Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.